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It was narrated from Ibn ‘Abbas that the Prophet (ﷺ) used to pray Witr while riding his mount

It was narrated that Jabir bin ‘Abdullah said:“The Messenger of Allah (ﷺ) said to Abu Bakr: ‘When do you pray Witr?’ He said: ‘At the beginning of the night, after ‘Isha’.’ He said: ‘And you, O ‘Umar?’ He said: ‘At the end of the night.’ The Prophet (ﷺ) said: ‘As for you, O Abu Bakr, you have seized the trustworthy handhold (i.e., you want to be on the safe side), and as for you, O ‘Umar, you have seized strength (i.e., you are confident that you have the resolve to get up and pray Witr).’” Another chain with similar meaning

It was narrated that ‘Abdullah said:“The Messenger of Allah (ﷺ) prayed, and he added or omitted something.” (One of the narrators) Ibrahim said: “The confusion stems from me (i.e., he was not sure which it was).” “It was said to him: ‘O Messenger of Allah! Has something been added to the prayer?’ He said: ‘I am only human, I forget just as you forget. If anyone forgets, let him perform two prostrations when he is sitting (at the end).’ Then the Prophet (ﷺ) turned and prostrated twice.”

‘Iyad narrated that he asked Abu Sa’eed Al-Khudri:“One of us prays and he does not know how many (Rak’ah) he has prayed.” He said: “The Messenger of Allah (ﷺ) said: ‘When anyone of you prays and does not know how many he has prayed, let him perform two prostrations while he is sitting.’”

It was narrated that ‘Abdullah said:“(Once) the Prophet (ﷺ) prayed Zuhr with five Rak’ah, and it was said to him: ‘Has something been added to the prayer?’ He said: ‘What is that?’ They told him, and he turned back towards the Qiblah and performed two prostrations.”

It was narrated from Ibn Buhainah:“The Prophet (ﷺ) offered prayer, I think it was the ‘Asr, and in the second Rak’ah he stood up before he sat. Before he said the Salam, he prostrated twice.”

It was narrated from ‘Abdur-Rahman Al-A’raj that Ibn Buhainah told him that the Prophet (ﷺ) stood up in the second Rak’ah of Zuhr and forgot to sit. When he had finished his prayer, and before he said the Salam, he performed the two prostrations for forgetfulness (Sahw) and said the Salam

It was narrated that Mughirah bin Shu’bah said:“The Messenger of Allah (ﷺ) said: ‘If anyone of you stands after two Rak’ah, if he has not yet stood up fully, let him sit down again, but if he has stood up fully, then let him not sit down, and let him perform two prostrations for forgetfulness (Sahw).’”

It was narrated that ‘Abdur-Rahman bin ‘Awf said:“I heard the Messenger of Allah (ﷺ) say: ‘If anyone of you is uncertain as to whether he has prayed one or two Rak’ah, let him assume it is one. If he is uncertain as to whether he has prayed two or three, let him assume it is two. If he is uncertain as to whether he has prayed three or four, let him assume it is three. Then let him complete what is left of his prayer, so that the doubt will be about what is more. Then let him prostrate twice while he is sitting, before the Taslim (saying the Salam).’”

It was narrated that Abu Sa’eed Al-Khudri said:“The Messenger of Allah (ﷺ) said: ‘If anyone of you is uncertain about his prayer, let him put aside uncertainty and act upon that which is certain. When he has made sure his prayer is complete, then let him prostrate twice. Then if his prayer was complete, that (extra) Rak’ah will be counted as voluntary, and if his prayer was lacking, that Rak’ah will complete his prayer, and the two prostrations will rub the Satan’s nose in the dust.’”

It was narrated that ‘Abdullah said:“The Messenger of Allah (ﷺ) offered prayer, and I am not sure whether he did something extra or omitted something. He asked, and we told him, so he turned to face the Qiblah and prostrated twice, then he said the Salam. Then he turned to face us and said: ‘If any new command has been revealed concerning the prayer, I would certainly have told you. But I am only human and I forget and you forget. If I forget, then remind me. And if anyone of you is uncertain about the prayer, let him do what is closest to what is correct, then complete the prayer, say the Salam and prostrate twice.”

It was narrated that ‘Abdullah said:“The Messenger of Allah (ﷺ) said: ‘If anyone of you is uncertain about his prayer, let him try to do what is correct then let him prostrate twice.’” Tanafisi said: "This is the basic rule, and no one is able to reject it

It was narrated from Ibn ‘Umar that the Messenger of Allah (ﷺ) forgot and said the Taslim after two Rak’ah. A man who was called Dhul-Yadain said to him:‘O Messenger of Allah, has the prayer been shortened or did you forget?’ He said: ‘It has not been shortened and I did not forget.’ He said: ‘But you prayed two Rak’ah.’ He said: ‘Is what Dhul-Yadain says true?’ They said: ‘Yes.’ So he went forward and performed two Rak’ah and said the Salam, then he prostrated twice for prostrations of forgetfulness

It was narrated that Abu Hurairah said:“The Messenger of Allah (ﷺ) led us in one of the afternoon prayers, and he prayed two Rak’ah, then he said the Salam. Then he stood up and went to a piece of wood in the mosque, and leaned against it. Those who were in a hurry left the mosque, saying that the prayer had been shortened. Among the people were Abu Bakr and ‘Umar, but they dared not say anything. Among the people there was also a man with long hands who was called Dhul- Yadain. He said: ‘O Messenger of Allah, has the prayer been shortened or did you forget?’ He said: ‘It has not been shortened and I did not forget.’ He said: ‘But you prayed two Rak’ah.’ He said: ‘Is what Dhul- Yadain says true?’ They said: ‘Yes.’ So he went forward and performed two Rak’ah and said the Salam, then he prostrated twice, and then he said the Salam again.”

It was narrated that ‘Imran bin Husain said:“The Messenger of Allah (ﷺ) said the Salam after three Rak’ah for ‘Asr, then he stood up and went into the apartment. Khirbaq, a man with big hands, stood up and called out: ‘O Messenger of Allah! Has the prayer been shortened?’ He came out angrily, dragging his lower garment, and asked about it, and was told (what had happened). So he performed the Rak’ah that he had omitted, then he said the Salam, then he prostrated twice and said the Salam again.”

It was narrated from Abu Hurairah that the Prophet (ﷺ) said:“The Satan comes to any one of you while he is praying and comes between him and his soul, until he does not know whether he as added something or omitted something. If that happens, then he should prostrate twice before the Salam, then he should say the Salam.”

It was narrated from Abu Hurairah that the Prophet (ﷺ) said:“The Satan comes between the son of Adam and his soul, and he does not know how many Rak’ah he has prayed. If a person notices that, then let him prostrate twice before he says the Salam.”

It was narrated from ‘Alqamah that Ibn Mas’ud prostrated twice for the prostrations of forgetfulness after the Salam, and he mentioned that the Prophet (ﷺ) did that.”

It was narrated that Thawban said:“I heard the Messenger of Allah (ﷺ) say: ‘For every mistake there are two prostrations, after saying the Salam.’”

It was narrated that Abu Hurairah said:“The Prophet (ﷺ) came out to pray and said the Takbir, then he gestured to them to wait. He went and took a bath, and his head was dripping with water while he led them in prayer. When he finished he said: ‘I came out to you in a state of sexual impurity, and I forgot until I had started to pray.’”

It was narrated that ‘Aishah said:“The Messenger of Allah (ﷺ) said: ‘Whoever vomits, has a nosebleed, belches, or emits prostatic fluid, should stop praying; perform ablution, then resume his prayer, and while he is in that state he should not speak.”

It was narrated from ‘Aishah that the Prophet (ﷺ) said:“When anyone of you performs prayer and commits Hadath, (passing wind) let him take hold of his nose, then leave.” Another chain with similar wording

It was narrated that ‘Imran bin Husain said:“I suffered from Nasur* and I asked the Prophet (ﷺ) about prayer. He said: ‘Perform prayer standing; if you cannot, then sitting; and if you cannot then while lying on your side.’”

It was narrated that Wa’il bin Hujr said:“I saw the Prophet (ﷺ) performing prayer while sitting on his right side when he was sick.”

It was narrated that Umm Salamah said:‘By the One Who took his soul (i.e., the soul of the Prophet (ﷺ)), he did not die until he offered most of his prayers sitting down. And the dearest of the actions to him was the righteous action that the person does regularly, even if it were a little.”